| 摘要 |
A device (1) for preventing the growth of the bacteria or removing the bacteria bred on the inner wall surfaces of the ducts (8, 9, 10) of a dental unit, comprising a transponder (3) having a control unit (2) generating electric signals including audible frequency components, a coil (3a), and a case (3b) for storing the coil (3a) and mounting means (5) for mounting the transponder (3) on the outer wall surface of the duct (8), whereby an audibl e frequency electric signal allowed to transmit through the ducts (8, 9, 10) i s generated by applying the electric signals to the coil (3a).
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